Blood vascular system in cockroach is

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Open type, with poorly-developed blood vessels

Open type, with well-developed blood vessels

Closed type, with poorly-developed blood vessels

Closed type, with well-developed blood vessels

answer is A.

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Detailed Solution

Blood vascular system of cockroach is of open type. Blood vessels are poorly developed and open into space (haemocoel). Visceral organs located in the haemocoel are bathed in blood (haemolymph).

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